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Ireland and Britain were both separated from the European continent at about this time (c. 12,000 BCE). The first people arrived in Ireland between 7,000-6,500 BCE at Coleraine in the far north. The Mount Sandel Mesolithic Site, discovered at Coleraine in 1973 CE, is the oldest archaeological site in Ireland.
The next oldest seafloor is found in the north-eastern Atlantic Ocean and the north-eastern Pacific Ocean, as far as possible from the mid-ocean ridges where they were created. These parts of the seafloor are about 200 million years old. craton is a stable part of the continental lithosphere, which has survived several cycles responsible for the merge and the dislocation of supercontinents. Cratons are therefore always found within continents.